In the past year or two, we've seen a number of notable changes in the way people check and read their email. For example, many folks who bought the Apple Watch often use it to check email; Office 365 replaced Outlook.com; and more people than ever are using email apps on their smartphones.

How has this affected email client market share?

As part of their 2016 "State of Email" report, the folks at Litmus analyzed over 13 billion email opens to see where subscribers are opening and reading emails. Check out the resulting infographic below to learn how email client market share statistics have changed in the past year, why these changes happened, and how they might affect your email campaigns.